<html>
<pre class="textdiagram" id="fig14">
             +-------------+
             |             |
             |  Ventilator |
             |             |
             +-------------+
             |    PUSH     |
             \------+------/
                    |
                  tasks
                    |
    +---------------+---------------+
    |               |               |
    |     /=--------|-----+=--------|-----+------\
  task    |       task    |        task   |      :
    |     |         |     |         |     |      |
    v     v         v     v         v     v      |
/------+-----\  /------+-----\  /------+-----\   |
| PULL | SUB |  | PULL | SUB |  | PULL | SUB |   |
+------+-----+  +------+-----+  +------+-----+   |
|            |  |            |  |            |   |
|   Worker   |  |   Worker   |  |   Worker   |   |
|            |  |            |  |            |   |
+------------+  +------------+  +------------+   |
|    PUSH    |  |    PUSH    |  |    PUSH    |   |
\-----+------/  \-----+------/  \-----+------/   |
      |               |               |          |
    result          result          result       |
      |               |               |          |
      +---------------+---------------+          |
                      |                          |
                   results                       |
                      |                          |
                      v                          |
               /-------------\                   |
               |    PULL     |                   |
               +-------------+                   |
               |             |                   |
               |    Sink     |                   |
               |             |                   |
               +-------------+                   |
               |     PUB     |                   |
               \------+------/                   |
                      |                          |
                 KILL signal                     |
                      |                          |
                      \--------------------------/
</pre>
</html>
